Fiction has always affected our lives. The majority of the media we consume contains some sort of fictional element, whether it be the characters or the setting. Even those doctor shows you watch on Netflix have a fictional element to it despite how factual the information presented is. Not everything fictional has to take place in a world entirely separate from ours.
Of course, anyone would know that fictional media is not real. While some may be more factual than others in its contents, the people in these shows are not real. But there’s a subsect of people in the world who believe that they have ties to fictional worlds beyond our own.
More often than not, these individuals believe that one or more of the characters in the media they consume is them, or a version of them that leaked into our world. With the theory of the multiverse spreading among the minds of the people, mix in some beliefs of reincarnation or parallel timelines and their identity doesn’t seem so farfetched.
These fictional-identifying folks are already a subset of another, larger community of non-human individuals. Otherkin is a term for a larger community, specifically defined as “a person who identifies as nonhuman.”
This community can be split even further down, but if we dissected it all now, we’d be here for hours. As for those who believe their identity to be of a fiction-based origin, this community is labeled as fictionkin. Fictionkin is a subset of otherkin, but instead of identifying as nonhuman, they identify as a fictional character, while they may still feel nonhuman.